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A bi-polar Triple-Output Converter with Duty Cycle Estimation

Circuits and Systems 2016年第4期7卷 198-210页

作者： Kumaraswami Sundararaman Mahadevan Gopalakrishnan Electrical & Electronics Engineering Department Sri Venkateswara College of Engineering Sriperumbudur India

This paper proposes a triple output converter with buck, boost and inverted outputs and controlled through duty cycle estimation. In the existing converter, to generate the negative output, the power flows from load to the supply (from the boost output to the supply) during a part of the cycle, which increases cycle time and losses, and reduces the power level. To overcome this, a modified converter with a main and an auxiliary inductance and with reduced number of switches is proposed. The converter can operate in continuous and discontinuous conduction modes and the outputs can be independently controlled. An analysis of the converter is done for both modes. A simplified control of the converter through duty cycle estimation is suggested to regulate the outputs, which does not have the constraint that the current ripple has to be small. The control works both in the continuous and discontinuous modes. The simulation results closely match with the analysis. A prototype of the converter is constructed with a Spartan FPGA system and results have been presented.

关键词： Multi-Output Dual Output DC-DC Converter Predictive Control bi-polar

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BRICS and Geopolitics： A Match Made in Heaven？

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International Relations and Diplomacy 2015年第6期3卷 389-398页

作者： Zeynep Kaya Gedik University Istanbul Turkey

We are living in a multi-polar world under the greater influence of one power. After the shutdown of the government in the US, it can be said that the sole power is about to be challenged. This paper hopes to establish the fact that the future of the international system will continue to be multi-polar. Economic groupings like the Brazil, Russia, India, China, and South Africa （BRICS）, Mexico, Indonesia, Singapore and Turkey （MIST） and others denote to this. These groupings may present an alternative to geographically locked but indispensible European Union. Despite the system being multi-polar, the United States dominates the international system. This paper deals with the BRICS countries that propose a bid for power in international relations. Will they have equidistant power form one another or will there be a hierarchy in between them？ Can they take/make economic or political decisions？ Is a geographically spread power structure more effective in controlling the balances between war and peace？ Can they remain objective on trouble spots that may arise in Europe, the Middle East, the Balkans, Asia and the Americas？ This paper hopes to achieve the goal of providing a framework for understanding a multi-polar approach to international relations based on the collaboration of BRICS countries. The first part will be the theoretical framework of the paper. The second part will be concerned with American supremacy in foreign relations and the need to question it. The third part will deal with emerging powers but since the most influential ＂power politics＂ are steered by China and Russia the main emphasis will be on them. The last part will come to the conclusion.

关键词： BRICS bi-polar multi-polar American policy intemational system

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